I think it is important to separate and have clear distinction between half year teams and full year teams. I think you should look at your half year teams as your farm teams. Definitely a different uniform (and one that isn't as nice), level limited, and lower quality music and choreography. A half year team should be a half year experience. You don't expect as much out of the kids and they shouldn't expect as much out of you. Otherwise your half year can cannibalize your full year stuff. Now this doesn't mean you don't try with them or you don't give them a nice experience. But if high schoolers can do high school season, skip out on summer conditioning and practices during the fall, then you are going to find yourself with a LOT less kids in your full year program. Half year should be supplementary, not primary.
A half year Stingray kid will try out and get a nice little level 1 or 2 experience. Get a nice uniform, practice twice a week, only a few extra practices near the end, way less intense, compete once (maybe twice) at a small local competition and get a nice after school activity. Attendance at half year teams is worse and parents are more likely to pull their kids for bad grades or as punishment. It is less detrimental (notice I said less, not NOT detrimental) and the teams are built to handle that better.
I think we have found some kids move up to full year but a lot of kids stay half year. I think this is great because the kids who want to stay half year probably would not have enjoyed (and quit) the full year team. Now we offer something for both types of kids.
I HIGHLY encourage all gyms to do something to the way we have set this up.